MGM’S COLLEGE OF ENGINEERING AND TECHNOLOGY UNDER THE GUIDEDANCE OF MRS. SARIKA RAUT ASST.PROFESSOR (EC department) RAVI ARORA 1109531045
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Jul 13, 2015
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MGM’S COLLEGE OF ENGINEERING AND TECHNOLOGY
UNDER THE GUIDEDANCE OF
MRS. SARIKA RAUTASST.PROFESSOR (EC department)
RAVI ARORA 1109531045
INTRODUCTION TO THE TECHNOLOGYINTRODUCTION TO THE TECHNOLOGY
History & Development
* In 1971 Dr. Sam Hurst, founder of Elographics developed the first touch opaque sensor “Elograph” at the University of Kentucky.
* In 1974 He developed the first real touch screen.
* In 1977, Elographics developed the five-wire resistive technology then with the backing of Siemens Corporation, developed a curved glass sensor called the touch screen.
* The new transparent technology, AccuTouch, was later developed by the founders of Elographics, Dr. Hurst and Bill Colwell
A touch screen sensor is a clear glass panel with a touch responsive surface
The sensor generally has an electrical current or signal going through it and touching the screen causes a voltage or signal change
The controller is a small PC card that connects between the touch sensor and the PCThe controller determines what type of interface/connection you will need on the PC
The driver is a software that allows the touch screen and computer to work together. It tells the operating system how to interpret the touch event information that is sent from the controller.
Most touch screen drivers today are a mouse-emulation type driver. This makes touching the screen the same as clicking your mouse at the same location on the screen.
Diagram showing How it Works
* Resistive Touch Screen
* Capacitive Touch Screen
* Surface Acoustic Wave Touchscreen
* Infrared Touch Screen
Types of Touch Screen Technologies:
Resistive Touch Screen
RESISTIVE A resistive touch screen panel is composed of several layers, the most important of which are two thin, metallic, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing. It is used in Grocery Stores, Hotels, Restaurants and Retail Stores.
Capacitive Touch Screen
CAPACITIVE
A capacitive touch screen panel consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO). As the human body is also a conductor, touching the surface of the screen results in a distortion of the body's electrostatic field, measurable as a change in capacitance.
Surface Acoustic Wave Touchscreen
Surface Acoustic Wave
Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. SAW touch screen technology is suggested for use in ATMs, Amusement Parks, Gaming Environments, Industrial Control Rooms etc.
Infrared Touch Screen
An infrared touch screen uses an array of X-Y infrared LED and photo detector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. Infra-red bezels have proven to be a very reliable technology for use in ATMs,Medical Instrumentation and Transportation Tracking applications.
INFRARED
Touch Screen Technology Comparison Chart
Public Information Displays::: Tourism displays, Trade show display
Customer Self-Services::: Stores, Restaurants, ATMs, Airline ticket terminals and Transportation hubs.
More uses... Digital jukeboxes, Computerized gaming, Student Registration systems, Multimedia software , Scientific applications etc.
Pros & ConsDirect pointing to the objects.FastFinger or pen is usable (No cable required)No keyboard necessarySuited to: novices, application for information retrieval etc
Low precision by using fingerUser has to sit or stand closer to the screenThe screen may be covered more by using handNo direct activation to the selected function
Though the touch screen technology contains some limitations it’s very user friendly, fast, accurate, easy for the novices & fun to operate. It has been widely accepted. And now by just modifying a little it can replace the mouse and key board completely in near future
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